Apparatus for sizing paper.



Hf Nl. WHEELWRIGHT.. APPARATUS FOR SIZING PAPER.

APPLICATION' FILED JUNE 2a, 1916.

1,258,840. 4 Patented Mar. 12, 1918.

narran sraaas alwaar aravaca.

HENRY lVI. WHEELWRIGHT, 0F WARE, MASSACHUSETTS, ASSIGNOR TO FECULOSE COM- PANY 0F AMERICA, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSA- CHUSETTS.

APPARATUS FORSIZIN G- PAPER.

specification gf Letters; Patent.'

PatentedMar. i12, i918.

Application filed June 28, 1916. Serial No. 106,499.

To all whm t may concern: Y

Be it known that I, HENRY M. WHEEL- wnreirn@J citizen of the United States, re-

. siding at Ware, in the county of Hampshire the apparatus, namely, the difficulty of han dling the soft paper stock, the disadvantage due to the fact that it tends .to stick to the soft sizing cylinder and the fact that 'the surplus sizing is likely to be carried around and interfere with the delivery of fresh sizing to the cylinder. l d

Reference is to be had to the accompanying drawings in Which- Figure 1 is an end view partly diagrammatical of the mechanism by which the siz'- ing is applied to a web of paper constructed in accordance with a preferred embodiment of `this invention; 4

Fig. 2 is a plan of the same, and

Fig. 3 is a transverse sectional View on, enlarged scale.

The method of sizing is the same as that set forth in my above mentioned patent, and

the apparatus is the same in principle, the differences being in the relative arrangement of the parts and details of construction. In

- fact the sizing of the lower side of the web is done exactly as shown in the above mentioned patent by means of a hard surfaced cylinder 10 operating in a trough of size 12 and having a Wiper or scraping blade 15 for removingthe surplusu on the supply side thereof The surface of this cylinder may be of metal, wood or other hard material.n

It is found in practice to coat the under surface of the web in a satisfactory manner because any surplusk of sizing is squeezed back between the rolls and does not interfere with the vapplication of sizing toy the web or admit of the application of too much sizing.

According to this invention the upper surface of the web is coated directly by what I call a soft' cylinder 11. This cylinder is made with a relatively soft surface, preferably rubber. The web is led to this cylinder over a hard metallic or wooden roll 16 and the surface to be coated by this roll is brought into contact with it between the two rotary members l1 and 16. Then in order to prevent the web from having too great 'a surface contact with the cylinder 11, and also to insure a more even coating, it is carried directly away from the surface .of this cylinder around a small roll 17 and then back to the cylinder at a shortdistance only from the point of contact of the two cylinders 10 and 11. This insures that the sui:- face of the web shall be intimately coated throughout its width on account of bring- `ing the coated surface over the roll 17 and does not admit of keeping the web in contact with the cylindertoo long a period of time.

The -c oating of the cylinder 11 is shown as being done in the following way. The sizing material, preferably feculose as stated in my 4above mentioned patent, is held in a trough 18 which is supported by the frame ofe the machine in a manner not necessary to describe in detail. This trough supports a pair of movable deckles 19 which can be adjusted toward and from the center of the trough and support a plate 20 from which extends a flexible apron 21. This apron extends substantially throughout the length lof the surface to be coated. This apron may be formed of any desired flexible material,

but I have found patent leather to be very'\ with the deckles and having a lead or tin lining. They have air discharge passages on their inner sides for forcing inwardly the edges of the film of size deposited on the cylinder to spread it between thel tubes and keep it in that space. This size feeds by gravity from the trough 1 8 through holes 23 on the apron and passes up the side 0f the cylinder where it comes into contact with the web. lt is squeezed on this web between the roll 16 and the cylinder'll which spreads it out to substantially its original width on the web, that is the full widthof the web. The web is'then separated almost immediately from the surface of the cylinder 11 where the wet side passes over the roll 17, which furthery spreads the coating and makes it more homogeneous on the web. Thenit passes back tothe surface of the cylinder and is pressed between this cylinder and the cylinder l0 at the time when the other side is coated by the latter. Forcleaning the cylinder l1 a doctor roll 24 is located in contact therewith between the point at which the web .is delivered'from it and the point at which the sizing is delivered to it. This takes surplus sizing from the cylinder so as to present a clean surface to the sizing delivery device. The doc'tor iscleaned by a l blade 25.

llt will` be understood, of course, that this process is applied to a web of paper or paper stock in substantially the condition and the period in its manufacture represented in my above mentioned patent, matters set forth therein not being repeated here fo-r obvious reasons. rlhis web has not the consistency of completed paper however and therefore ordinary coating methods are not applicable. By this arrangement the upper surface of the soft web can be coated uniformly and rapidly.

Although. l have illustrated and described only a single embodiment of-the invention, I am aware of the fact that many modiiications can be made therein by any person skilled in the art without departing from the scope of the invention as expressed in the claims. rlherefore ll do not wish to be limited to all the details of construction herein shown and described, buty what l do claim is l. In an apparatus for sizing a web of paper stock during the manufacture of the paper, the combination with a hard cylinder running in a trough of size for coating the web from that cylinder and bringing it back Vto it and passing it between the two cylinders.

' 2.1m an apparatus for sizing the upper surface of a web, the combination of a sizing cylinder, means for delivering a film of size to the surface of the cylinder, means for sized surface of the cylinder, means for then .removing the web from 'contact with the cylinder, and later bringing it into contact with it at the bottom thereof, and means for then bringing the web into contact with said pressing the web against' the cylinderjust before it leaves the surface thereof.

3. lln an apparatus for sizing a web of paper stock, the combination with a cylinder, of means for coating the surface of said cylinder with size, means for bringing a web to be coated into contact with the surface of said cylinder at a point on said surface to enable the size to be applied directly to the web by the cylinder, means for then'taking the web out of contact with the cylinder, and means for thereafter pressing it against the cylinder and directing it away from its surface.

lln testimony whereof l have hereunto aiiixed my signature.

HENRY M. WHEELWRllGll-lll. 

